Demonstration of broadband chirped grating couplers for MPW fabrication

2019 ◽  
Author(s):  
Wenyu Li ◽  
Jifang Qiu ◽  
Ye Tian ◽  
Zhenli Dong ◽  
Zexin Yu ◽  
...  
Keyword(s):  
Grating Couplers ◽  
Chirped Grating

Bi-wavelength two dimensional chirped grating couplers for low cost WDM PON transceivers

2011 ◽  
Vol 284 (8) ◽  
pp. 2242-2244 ◽  
Author(s):  
Lin Xu ◽  
Xia Chen ◽  
Chao Li ◽  
Hon Ki Tsang
Keyword(s):  
Low Cost ◽  
Two Dimensional ◽  
Grating Couplers ◽  
Chirped Grating ◽  
Wdm Pon

High-efficiency Chirped Grating Couplers on Lithium Niobate on Insulator

2021 ◽  
Author(s):  
Shuting Kang ◽  
Ru Zhang ◽  
Zhenzhong Hao ◽  
Di Jia ◽  
Feng Gao ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Efficiency ◽  
Grating Couplers ◽  
Chirped Grating

High-efficiency chirped grating couplers on lithium niobate on insulator

2020 ◽  
Vol 45 (24) ◽  
pp. 6651
Author(s):  
Shuting Kang ◽  
Ru Zhang ◽  
Zhenzhong Hao ◽  
Di Jia ◽  
Feng Gao ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Efficiency ◽  
Grating Couplers ◽  
Chirped Grating

scholarly journals Biaxial 360-degree scanning LIDAR using a liquid crystal control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seiji Nishiwaki
Keyword(s):  
Liquid Crystal ◽  
Laser Light ◽  
Side Surface ◽  
Parallel Beam ◽  
Grating Couplers ◽  
Autonomous Cars ◽  
Scanning Lidar ◽  
Center Axis ◽  
Circular Grating ◽  
Segmented Electrode

AbstractSophisticated non-mechanical technology for LIDARs is needed to realize safe autonomous cars. We have confirmed the operating principle of a non-mechanical LIDAR by combining concentric circular-grating couplers (CGCs) with a coaxially aligned rod lens. Laser light incident vertically on the center of the inner CGC along the center axis of the lens is radiated from the outer CGC and passes through the side surface of the lens. It is converted to a parallel beam that scans in two axes by applying voltages to two area-segmented electrode layers sandwiching the CGCs and a liquid crystal layer formed on the CGCs. We have demonstrated scanning whose motion ranges were 360 degrees horizontally and 10° vertically. A beam with a spread angle of 0.3° × 0.8° at a minimum swept vertically up to a frequency of 100 Hz and ten equally spaced beams scanned rotationally with a 6-degree cycle variation of spread of between 0.8° and 3.5°.

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